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What helps you keep warm at an outdoors show when it’s cold enough to make you forget you have fingers? Dancing. It gets the blood flowing. Plus, hipsters love to dance. It’s a rite that allows for shaking in ultra-hip convulsions.

And what does Rainbow Arabia, the boy-girl, electro-pop duo from L.A., make you want to do while blowing its whistles and shaking its rattles on stage? Dance, dance, dance! Which is precisely what the crowd was doing throughout Rainbow Arabia’s Reverb set Saturday at the Beauty Bar and its encore, which came about after the crowd’s loud chant for “one more song!”